

Apple previously released OS X v10.8.2 Supplemental Update 1.0 at the beginning of October.About OS X Mountain Lion 10.8.2 Supplemental Update 2.0
This update addresses an issue with Keychain that can affect 2012 Mac systems.
This update is recommended for all Mac systems introduced in 2012.
Article Link: Apple Releases OS X Mountain Lion 10.8.2 Supplemental Update 2.0